51685353 has 12 divisors (see below), whose sum is σ = 74882548. Its totient is φ = 34352640.

The previous prime is 51685351. The next prime is 51685369. The reversal of 51685353 is 35358615.

It can be written as a sum of positive squares in 2 ways, for example, as 31945104 + 19740249 = 5652^2 + 4443^2 .

It is not a de Polignac number, because 51685353 - 2¹ = 51685351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51685351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5488 + ... + 11553.

Almost surely, 2^51685353 is an apocalyptic number.

It is an amenable number.

51685353 is a deficient number, since it is larger than the sum of its proper divisors (23197195).

51685353 is a wasteful number, since it uses less digits than its factorization.

51685353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17384 (or 17381 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 51685353 is about 7189.2526037134. The cubic root of 51685353 is about 372.4967565743.

The spelling of 51685353 in words is "fifty-one million, six hundred eighty-five thousand, three hundred fifty-three".